Environmental controls on seasonal ecosystem evapotranspiration/potential evapotranspiration ratio as determined by the global eddy flux measurements

Liu, Chunwei; Sun, Ge; McNulty, Steven G.; Noormets, Asko; Fang, Yuan

doi:10.5194/hess-21-311-2017

Articles | Volume 21, issue 1

https://doi.org/10.5194/hess-21-311-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue:

Vegetation changes under a changing environment and the impacts...

https://doi.org/10.5194/hess-21-311-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 21, issue 1

Research article

|

18 Jan 2017

Research article |

| 18 Jan 2017

Environmental controls on seasonal ecosystem evapotranspiration/potential evapotranspiration ratio as determined by the global eddy flux measurements

Chunwei Liu, Ge Sun, Steven G. McNulty, Asko Noormets, and Yuan Fang

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Views and downloads (calculated since 24 May 2016)

Month	HTML	PDF	XML	Total
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Aug 2016	12	3	0	15
Sep 2016	5	0	5
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Dec 2016	1	0	1
Jan 2017	212	65	5	282
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Mar 2017	38	25	2	65
Apr 2017	46	30	1	77
May 2017	44	19	0	63
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Feb 2018	19	18	0	37
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Apr 2018	12	13	0	25
May 2018	20	9	1	30
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Jul 2018	6	10	0	16
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Mar 2020	12	8	0	20
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Jan 2022	32	23	0	55
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Apr 2022	15	8	2	25
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Jun 2022	21	14	2	37
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Jan 2023	24	22	0	46
Feb 2023	21	13	1	35
Mar 2023	38	24	1	63
Apr 2023	48	71	2	121
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Jun 2023	18	16	1	35
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Aug 2023	25	13	1	39
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Mar 2024	28	31	4	63
Apr 2024	28	25	3	56
May 2024	40	32	6	78
Jun 2024	63	23	2	88
Jul 2024	27	23	3	53
Aug 2024	44	6	2	52
Sep 2024	25	14	0	39
Oct 2024	32	32	0	64
Nov 2024	19	20	1	40
Dec 2024	17	20	2	39
Jan 2025	27	24	4	55
Feb 2025	20	19	0	39
Mar 2025	39	21	1	61
Apr 2025	24	21	2	47
May 2025	22	16	0	38
Jun 2025	37	23	0	60
Jul 2025	20	18	3	41
Aug 2025	24	40	1	65
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Oct 2025	41	30	1	72
Nov 2025	19	23	0	42

Cumulative views and downloads (calculated since 24 May 2016)

Month	HTML	PDF	XML	Total
May 2016	159	61	1	221
Jun 2016	28	14	1	43
Jul 2016	16	2	0	18
Aug 2016	12	3	0	15
Sep 2016	5	0	5
Oct 2016	3	1	6	10
Nov 2016	8	10	18
Dec 2016	1	0	1
Jan 2017	212	65	5	282
Feb 2017	62	25	9	96
Mar 2017	38	25	2	65
Apr 2017	46	30	1	77
May 2017	44	19	0	63
Jun 2017	32	15	0	47
Jul 2017	15	8	0	23
Aug 2017	16	16	0	32
Sep 2017	18	18	1	37
Oct 2017	4	5	0	9
Nov 2017	15	22	0	37
Dec 2017	9	13	0	22
Jan 2018	9	19	0	28
Feb 2018	19	18	0	37
Mar 2018	15	14	0	29
Apr 2018	12	13	0	25
May 2018	20	9	1	30
Jun 2018	11	10	0	21
Jul 2018	6	10	0	16
Aug 2018	20	11	1	32
Sep 2018	20	12	0	32
Oct 2018	15	13	0	28
Nov 2018	20	13	0	33
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Jan 2019	15	9	0	24
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Apr 2019	9	5	1	15
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Jul 2019	10	13	0	23
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Feb 2021	18	8	0	26
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Apr 2021	11	8	1	20
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Jun 2021	21	7	1	29
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Feb 2022	13	6	1	20
Mar 2022	24	16	1	41
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Jun 2022	21	14	2	37
Jul 2022	16	7	0	23
Aug 2022	26	30	0	56
Sep 2022	33	8	0	41
Oct 2022	17	21	3	41
Nov 2022	25	7	0	32
Dec 2022	17	13	0	30
Jan 2023	24	22	0	46
Feb 2023	21	13	1	35
Mar 2023	38	24	1	63
Apr 2023	48	71	2	121
May 2023	48	85	1	134
Jun 2023	18	16	1	35
Jul 2023	20	15	3	38
Aug 2023	25	13	1	39
Sep 2023	19	16	1	36
Oct 2023	32	29	3	64
Nov 2023	21	10	1	32
Dec 2023	28	17	2	47
Jan 2024	37	15	2	54
Feb 2024	24	14	2	40
Mar 2024	28	31	4	63
Apr 2024	28	25	3	56
May 2024	40	32	6	78
Jun 2024	63	23	2	88
Jul 2024	27	23	3	53
Aug 2024	44	6	2	52
Sep 2024	25	14	0	39
Oct 2024	32	32	0	64
Nov 2024	19	20	1	40
Dec 2024	17	20	2	39
Jan 2025	27	24	4	55
Feb 2025	20	19	0	39
Mar 2025	39	21	1	61
Apr 2025	24	21	2	47
May 2025	22	16	0	38
Jun 2025	37	23	0	60
Jul 2025	20	18	3	41
Aug 2025	24	40	1	65
Sep 2025	58	30	1	89
Oct 2025	41	30	1	72
Nov 2025	19	23	0	42

Latest update: 19 Nov 2025

Short summary

The paper aimed at deriving K_c (AET/PET) for multiple vegetation types and understanding its environmental controls by analyzing the accumulated global eddy flux (FLUXNET) data. We established multiple linear equations for different land covers and seasons to model the dynamics of K_c as function of LAI, site latitude, and precipitation. Our study extended the applications of the traditional K_c method for estimating crop water use to estimating AET rates for natural ecosystems.